Koishi 1108

Hi everyone, I hope you're all doing well. A couple of days ago, I got interested in installing Linux on one of these Chinese TV boxes to use it with a 3D printer. I've been trying to follow the tutorial step by step, but I'm having a problem. The box boots into Multitool correctly, and at first, it let me burn the image to the flash, but it didn't work. Now I'm trying again, but it's giving me an error saying there is no eMMC. I'm not sure what’s going on — could someone please help me? Thanks in advance!